Add dedicated local admin domain routing

app/_admin/maintenance/actions.ts

@@ -4,7 +4,7 @@ import { revalidatePath } from "next/cache";
 import { redirect } from "next/navigation";
 
 import { routing } from "@/i18n/routing";
-import { toInternalAdminPath } from "@/lib/admin-routing";
+import { getAdminAppPath, toInternalAdminPath } from "@/lib/admin-routing";
 import { clearAdminSessionCookie, isAdminAuthenticated } from "@/lib/admin-auth";
 import { getLocalizedPath } from "@/lib/locale";
 import { setMaintenanceMode } from "@/lib/app-config";
@@ -12,7 +12,7 @@ import { setMaintenanceMode } from "@/lib/app-config";
 async function ensureAdmin() {
   if (!(await isAdminAuthenticated())) {
     await clearAdminSessionCookie();
-    redirect("/");
+    redirect(getAdminAppPath("/"));
   }
 }
 
@@ -20,7 +20,7 @@ export async function updateMaintenanceModeAction(formData: FormData) {
   await ensureAdmin();
 
   const nextValue = formData.get("enabled") === "true";
-  const redirectPath = String(formData.get("redirectPath") ?? "/");
+  const redirectPath = String(formData.get("redirectPath") ?? getAdminAppPath("/"));
   const redirectUrl = new URL(redirectPath, "http://localhost");
   redirectUrl.searchParams.set(
     "success",